The classical limit of the quantum mechnical expressions for the kinetic theory cross sections

The integral expressions for the various kinetic theory cross sections describing collisions between nonvibrating diatomic molecules, based on the generalized phase shift development of molecular scattering theory, which were developed in a previous paper are considered further. It is shown that in the classical limit the expressions can be written in forms similar to the usual expressions for the special case of spherical molecules. The spherical harmonic Yl(χ,0) where χ is the angle of deflection, which appears in the expressions for the spherical case, is replaced by a properly coupled sum of products of three spherical harmonics and additional integrations over two sets of Euler angles arise.